Exercise 7.x1: Even all these years after the Y2K fuss, people are still confused about whether dates have two digits or four. We could prevent errors in data entry for our movie database by looking for movies that are made in ridiculously early years. If someone tries entering 99 instead of 1999, for example, we should reject it, since there were no movies in the year 99. The earliest movies in the Internet Movie Database (www.imdb.com) are from 1892, so that is probably a safe constraint to place on our movie database. Show how.
Do exercise 7.2 from page 456. Part of "faithfulness" is enforcing referential integrity.
Do exercise 7.9 from pages 458-459.